Oil-burner.



H. Wl MCCREERY..

OIL BURNER.

APPucATloN FILED FEB. 1s, 1915.

1,172,81 4. Patented Feb. 22, 1916.

WITNESSES:

Hugh W MCrery Vas HUGH W. MCCREERY, OF SEATTLE, WASI-IINGrTON.`

OIL-BURNER.

Specification of Letters Patent.

Patented Feb. 22, 1916.

Application led February 18, 1,915`.` Serial No. 9,007.

To all whom it may concern:

Be it known that I, HUGH W. MCCREERY, a citizen of the United States, residing at Seattle, in the county of King and State of Vashington, have invented certain new and useful Improvements in Oil-Burners, of

which the following is a specification.

My invention relates to improvements in oil burners and, more particularly, to improvements in automatic regulating devices for controlling the rate of flow of steam and oil to the point of combustion of such burners.

The object of my improvement is to provide a simple, reliable and efficient regulating device that is adapted to be associated with a furnace and connected with a boiler and with steam and fuel supply pipes to automatically regulate the supply of steam and fuel that is emitted to feed combustion within the furnace yin response to variations of the steam pressure within the boiler. I accomplish this object by devices illustrated in the accompanying drawings, in which- Figure 1 is a view in end elevation of an automatic regulating device embodying my invention; Fig. 2 is 'a view in side elevation of the same; Fig. 3 is a view in vertical cross section on broken line k3 3 of Fig. 1; Fig. 4 is a view in vertical cross-section on broken line 4 4 of Figl; vand Fig. 5 is a plan view of a detail embodied in my invention.

` Referring to the drawings throughout which like reference numerals indicate like parts, 6 and 7 are two cylindrically shaped members which form the body portion of my automatic regulating device, such members being provided with flanges 8 and 9, respectively, which are adapted to abut against each other and through which bolts 10 are passed to secure the body members 6 and 7 together. y

The member 6 ie previded et eppeetely disposed peinte with tapped beeeee 1l end 12 into which steam and fuel pipes 13 and 14, respectively, are Sereved, Sueh pipes eemmunicating through oblong rectangularly shaped port-openings 15 and 16 with valve chambers within which are disposed valves 17 and 18 each having a diamond-shaped passageway extending therethrough, whose major axis is disposed transversely of the major axis of the respective ports 15 and 16, as more clearly shown in Figs. 2 and 3, whereby the valve openings may be adjusted to any desired area" by rotating the valves 17 and 18- within their respective valve chambers, the pipes 13 and 14 being providedD with shut-off valves (not shown) vwhereby the supply of steam and fuel may be entirely shut off, if desired. t

Thevvalves 17 and 18 are provided with valve-stems 19 and 20,-respectively, which extend outwardly through suitable stuffing boxes 21 and are connected with brackets 22 and 23 that serve as crank arms by means of which such valve stems are turned to regulate the area of the openings through valves 17 and 18, the turning of such brackets being effected by links 24 and 25 which are connectedvwith a movable yoke 26.

Thelarger end of the member 6 is hollowed out to provide a pressure chamber 27 into which steam under pressure may be admitted through a steam-pipe 28 and a diaphragm 29 of thin flexible material, as

`sheet metal, is secured between the members 6 and 7 in such manner that it forms one side wall of the pressure chamber 27, as clearly shown in Fig. 3, the adjacent end of the member 7` being hollowed out to form a cavity 30 whereby the diaphragm 29 mayl be free to move outwardly when steam under pressure is admitted to the chamber 27.

Aconcentrically disposed hollow shank *31 is formed on the member 7 and a thrust bar or plunger 32 is disposed' to extend lengthwise within such shank 31 and is providedon its inner end with an enlarged porytion 33 that is held in contact with the diaphragm 29 by a helical compression spring 34 disposed within suitable keepers 35 and 36 in the shank 31. The bar 32 passes through a hole 37 in the yoke 26, the enlarged portion 33 of suchV bar forming a collar against which the yoke 26 is securely pressedby the keeper 35 of the spring 34, as clearly shown in 3, whereby the'yoke 2K6 will be caused to move simultaneously with thebar 32. The amount of compression exerted by the spring'34 may be increased or decreased by turning an adjustment screw 38 which governs the longitudinal position of the keeper 36 within the shank7. t Y

lThe links 24 and 25 are adapted -to screw into bars 39 and 40 that are secured to opposite ends of the yoke 2 6, each of such links being provided on its outer end with a knurled' hand-'wheel' 41 by which it may be turned to screw into or out of its bar 39 or 40 forl the purpose of'longitudinal adjustment and being further provided near its outer end with. a spherical enlargement 42 that is adapted to fit within grooves 48 formed on the inside surfaces of the U- shaped brackets 22 and 23, as more clearly shown in Fig. 4, there being provided in connection with each of the links 24 and 25, smaller U-shaped stirrups 44 that slide within the brackets 22 and 23 and straddle the spherical enlargements 42, as more clearly shown in Fig. 4, the members 44 each being connected with a screw 45 that screws through the closed end of one of the brackets 22 or 28 whereby the position of the end of the link 24 or 25 within its bracket may be adjusted longitudinally of said bracket to vary the length of the radius of action of said links on said valves.

The steam pipe 18 communicates, through the valve 17, with a passageway 46 located in the rear of a nozzleshaped tap 47 that is provided with a. tapering passageway 48 di rected toward an outlet pipe 49 that leads to a combustion chamber (not shown) and the fuel-supply pipe 14 communicates, tl'irough the valve 18. with another passageway 50 in front of the tap 47, as clearly Vshown in lFig. 3, whereby when steam under pressure is permitted to fill the passageway 46, it will be emitted at a high velocity from the contracted end of the passageway 48 and will create a suction through the passageway 50 thus drawing in fuel through such passage way 50, which fuel is thoroughly atomized, and mixed with the steam before it reaches the point of combustion.

Lugs 51 are provided on opposite sides of the shank 81 and set screws 52 are screwed through such lugs to provide an adjustable stop for the yoke 26 to limit the amount of rearward movement of said yoke, the amount of forward movement of said yoke being limited by itsengagement with the walls of the member 7. The brackets 22 and 23 are secured to the shafts 19 and 2O by pins 58, and transversely disposed set screws 54 are provided at the open. ends of each of such brackets to prevent such brackets from being sprung out of shape.

The operation of my automatic regulating device may be described as follows: The device is set up in a position to adapt it to fur nish fuel to a furnace that is associated with a boiler and the steam pipe 28 is connected with the boiler in order that the pressure within the pressure chamber 27 and the boilermay be the same at all times. The steam pipe 1-3 is connected with ythe boiler or with another source of live steam and the fuel pipe 14 is connected with a source of supply of fuel, as crude oil', which fuel is drawn in by the suction of the steam and mixed with such steam to feed combustion. When there is no steam pressure or when the pressure is low in the pressure chamber 27,

the diaphragm 29 will assume the position shownV in Fig. 3, and the yoke 26 will be moved `forwardly to its foremost `limit by the pressure of the spring 34, thus opening the valves 17 and 18 to a maximum and permitting a large quantity of steam and fuel to passthrough said valves, but when the steam pressure against the diaphragmx29 increases sufficiently to overcome the force of compression of the spring 84, then the yoke 26 will be moved backwardly by the plunger 32 and in an obvious manner will act through the links `24 and 25 and fthe brackets 22 and 23 to` rotate the valves 17y and 18 and reduce the area of the openings through which fuel and steam must pass to feed combustion, thus reducing the supply of fuel and permitting the furnace to. cool slightly. When the pressure in the boiler begins to drop due to the reduction in the amount of fuel delivered, then the pressurey ply. The pressure at which the valves 17 and 18 begin to close may be varied by turning the set screw 38 to increase or decrease the force exerted by the compression spring 84, and the relative movement of the valves 17 and 18'with respect to the movement of;

the yoke 26, may bevaried by turning the screws 45 to increase or decrease the distance between the center of rotation of such valves and the point of attachment of the links 24, 25 to the brackets 22, 23. The area of Opeliing of the valve 17.1nay be varied at any time by screwing the link 24 into or out of the bar 39 and the areay of opening 4of they valve 18 may be similarly varied by lscrewing the link 25 into or out of the bar 40, thus making it possible to regulate the maximum` combined area of opening of the two valves 1.7 and 18 and also to vary the relative areas of opening` of such two valves to secure a proper mixture of steam and fuel.

Obviously, numerous changes in the details and form of construction of the various parts embodied inmy regulating device may be resorted to without departing from the spirit of the invention or'sacrificing any of its advantages.

What I claim is- 1. A fuel regulating device of the class described embodying a movable yoke, valves controlling the fuel `and steam supply, respectively, provided with valve-stems, arms iixedlv secured to said valve stems, connecting devices extending between the ends of said yoke and said arms said devices each embodying a link and a screw providedwvith a. ball to form a ball and socket joint and adapted to screw into said link to vary the length of said connecting device and screws for varying the point of attachment of said connecting devices longitudinally of said lliIIlS.

2. An automatic regulating device for fuel, embodying rotary valves provided with valve stems adapted to control the fuel and steam supply, respectively, crank-arms secured to said valve stems at right angles thereto, links articulated with said crankarms and adapted to be moved longitudinally to rotate said valves, means to adjust the points of articulation of said links lengthwise of said crank arms, and means for varying the length of said links.

3. An automatic regulating device for fuel, embodying a movable yoke, rotary valves provided with valve stems adapted to control the fuel and steam supply, respectively, crank-aims secured to said valve stems at right angles thereto, said crankarms being in the form of U-shaped brackets having arcuate grooves on their inside surfaces, links each having one end connected with said yoke, the opposite end of each of said links being formed with a spherical enlargement adapted to fit Within said arcuate grooves in one of said brackets, stirrups adapted to straddle said spherical enlargements, screws associated with said stirrups and said U-shaped brackets for moving said enlarged ends of said links lengthwise of said brackets, and means for varying the length of each of said links between its point of connection with sai'd bracket and said yoke.

Signed at Seattle, Vashington, this 9th day of February, 1915.

HUGH W. MGCREERY.

Witnesses HORACE BARNES, E. PETERSON.

, Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, 2D. C. 

